Question

我的代码在我不使用代理但我想使用代理时工作，以便在发送请求时不会泄露我的真实IP。每当我尝试运行我的程序时，它会给我一个错误，说“远程服务器返回错误：（417）期望失败。”它指向“response = CType（request.GetResponse（），HttpWebResponse）”。我的代码有问题吗？我现在真的很困惑。任何帮助都会谢谢。

            Dim myProxy As New WebProxy("173.234.249.68", 8800)
            Dim request As HttpWebRequest
            Dim response As HttpWebResponse
            Dim tempCookies As New CookieContainer
            request = CType(WebRequest.Create("http://samplewebsite.com"), HttpWebRequest)
            request.Proxy = myProxy
            request.ContentType = "application/x-www-form-urlencoded"
            request.ContentLength = POST.Length
            request.KeepAlive = True
            request.CookieContainer = tempCookies

            response = CType(request.GetResponse(), HttpWebResponse)
            tempCookies.Add(response.Cookies)
            response.Close()

Answer 1

<Runtime.InteropServices.DllImport("wininet.dll", SetLastError:=True)> _
Private Shared Function InternetSetOption(ByVal hInternet As IntPtr, ByVal dwOption As Integer, ByVal lpBuffer As IntPtr, ByVal lpdwBufferLength As Integer) As Boolean
End Function


Public Structure Struct_INTERNET_PROXY_INFO
    Public dwAccessType As Integer
    Public proxy As IntPtr
    Public proxyBypass As IntPtr
End Structure

Private Sub UseProxy(ByVal strProxy As String)
    Const INTERNET_OPTION_PROXY As Integer = 38
    Const INTERNET_OPEN_TYPE_PROXY As Integer = 3

    Dim struct_IPI As Struct_INTERNET_PROXY_INFO

    struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY
    struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy)
    struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local")

    Dim intptrStruct As IntPtr = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI))

    Marshal.StructureToPtr(struct_IPI, intptrStruct, True)

    Dim iReturn As Boolean = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, System.Runtime.InteropServices.Marshal.SizeOf(struct_IPI))
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Label4.Text = (TextBox1.Text & ":" & TextBox2.Text)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
    UseProxy(Label4.Text)
    WebBrowser1.Navigate(TextBox3.Text)
End Sub

结束班

Answer 2

 Dim myProxy As New WebProxy("173.234.249.68:8800", true)
        Dim request As HttpWebRequest
        Dim response As HttpWebResponse
        Dim tempCookies As New CookieContainer
        request = CType(WebRequest.Create("http://samplewebsite.com"), HttpWebRequest)
        request.Proxy = myProxy
        request.ContentType = "application/x-www-form-urlencoded"
        request.ContentLength = POST.Length
        request.KeepAlive = True
        request.CookieContainer = tempCookies

        response = CType(request.GetResponse(), HttpWebResponse)
        tempCookies.Add(response.Cookies)
        response.Close()

Answer 3

改变界限：

Dim myProxy As New WebProxy("173.234.249.68", 8800)

到

Dim myProxy As New WebProxy("173.234.249.68:8800")

VB.net HttpWebRequest与代理

3 个答案: